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adraffy/ens-normalize.js
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0-dependencyEthereum Name Service (ENS) Name Normalizer.
npm i @adraffy/ens-normalize✓
- 🏛️ FollowsENSIP-15: ENS Name Normalization Standard
- Unicode:
17.0.0• CLDR:47 - Other implementations:
- Prior implementation:
- Javascript —ensdomains/eth-ens-namehash
- Breakdown Reports from ENSIP-1
- Unicode:
- ✅️ Passes100%ENSIP-15 Validation Tests
- ✅️ Passes100%Unicode Normalization Tests
- Minified File Sizes:
29KB— native NFC vianf-native.js usingString.normalize()⚠️ 38KBDefault — custom NFC vianf.js44KBEverything! — custom NFC + sub-libraries:parts.js,utils.js
- Included Apps:
- Related Projects:
import{ens_normalize}from'@adraffy/ens-normalize';// or require()// browser: https://cdn.jsdelivr.net/npm/@adraffy/ens-normalize@latest/dist/index.min.mjs (or .cjs)// *** ALL errors thrown by this library are safe to print ***// - characters are shown as {HEX} if should_escape()// - potentially different bidi directions inside "quotes"// - 200E is used near "quotes" to prevent spillover// - an "error type" can be extracted by slicing up to the first (:)// - labels are middle-truncated with ellipsis (…) at 63 cps// string -> string// throws on invalid names// output ready for namehashletnormalized=ens_normalize('RaFFY🚴♂️.eTh');// => "raffy🚴♂.eth"// note: does not enforce .eth registrar 3-character minimum
Format names with fully-qualified emoji:
// works like ens_normalize()// output ready for displayletpretty=ens_beautify('1⃣2⃣.eth');// => "1️⃣2️⃣.eth"// note: normalization is unchanged:// ens_normalize(ens_beautify(x)) == ens_normalize(x)
Normalize name fragments forsubstring search:
// these fragments fail ens_normalize()// but will normalize fine as fragmentsletfrag1=ens_normalize_fragment('AB--');// expected error: label extletfrag2=ens_normalize_fragment('\u{303}');// expected error: leading cmletfrag3=ens_normalize_fragment('οо');// expected error: mixture
Input-based tokenization:
// string -> Token[]// never throwslettokens=ens_tokenize('_R💩\u{FE0F}a\u{FE0F}\u{304}\u{AD}./');// [// { type: 'valid', cps: [ 95 ] }, // valid (as-is)// {// type: 'mapped',// cp: 82, // input// cps: [ 114 ] // output// },// {// type: 'emoji',// input: Emoji(2) [ 128169, 65039 ], // input// emoji: [ 128169, 65039 ], // fully-qualified// cps: Emoji(1) [ 128169 ] // output (normalized)// },// {// type: 'nfc',// input: [ 97, 772 ], // input (before nfc)// cps: [ 257 ], // output (after nfc)// tokens0: [ // tokens (before nfc)// { type: 'valid', cps: [ 97 ] },// { type: 'ignored', cp: 65039 },// { type: 'valid', cps: [ 772 ] }// ],// tokens: [ // tokens (after nfc)// { type: 'valid', cps: [ 257 ] }// ]// },// { type: 'ignored', cp: 173 },// { type: 'stop', cp: 46 },// { type: 'disallowed', cp: 47 }// ]// note: if name is normalizable, then:// ens_normalize(ens_tokenize(name).map(token => {// ** convert valid/mapped/nfc/stop to string **// }).join('')) == ens_normalize(name)
Output-based tokenization:
// string -> Label[]// never throwsletlabels=ens_split('💩Raffy.eth_');// [// {// input: [ 128169, 82, 97, 102, 102, 121 ],// offset: 0, // index of codepoint, not substring index!// // (corresponding length can be inferred from input)// tokens: [// Emoji(2) [ 128169, 65039 ], // emoji// [ 114, 97, 102, 102, 121 ] // nfc-text// ],// output: [ 128169, 114, 97, 102, 102, 121 ],// emoji: true,// type: 'Latin'// },// {// input: [ 101, 116, 104, 95 ],// offset: 7,// tokens: [ [ 101, 116, 104, 95 ] ],// output: [ 101, 116, 104, 95 ],// error: Error('underscore allowed only at start')// }// ]
Generate a sorted array of (beautified) supported emoji codepoints:
// () -> number[][]letemojis=ens_emoji();// [// [ 2764 ],// [ 128169, 65039 ],// [ 128105, 127997, 8205, 9877, 65039 ],// ...// ]
Determine if a character shouldn't be printed directly:
// number -> boolshould_escape(0x202E);// eg. RIGHT-TO-LEFT OVERRIDE => true
Determine if a character is a combining mark:
// number -> boolis_combining_mark(0x20E3);// eg. COMBINING ENCLOSING KEYCAP => true
Format codepoints as print-safe string:
// number[] -> stringsafe_str_from_cps([0x300,0,32,97]);// "◌̀{00} a"safe_str_from_cps(Array(100).fill(97),4);// "aa…aa" => middle-truncated
git clonethis repo, thennpm install- Follow instructions in/derive/ to generate data files
npm run derive
npm run make— compress data files from/derive/output/- Follow instructions in/validate/ to generate validation tests
npm run validate
npm run test— perform validation testsnpm run build— create/dist/npm run rebuild— run all the commands abovenpm run order— create optimal group ordering and rebuild again
- Build and compare againstinclude-versions.js
spec_hash— SHA-256 ofspec.json bytesens_hash_base64— SHA-256 ofinclude-ens.js base64 literalnf_hash_base64— SHA-256 ofinclude-nf.js base64 literal
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